.nav_menu {
  width: 200px;
  height: calc(100% - 50px);
  background: #ededed;
  float: left;
  position: fixed;
  left: 0;
  top: 50px;
  .title {
    margin-left: 20px;
    color: #888888;
    margin-bottom: 7px;
    padding-top: 20px;
    font-size: 14px;
  }
  .item_menu {
    height: 40px;
    line-height: 40px;
    padding-left: 20px;
    cursor: pointer;
    &:hover {
      background: #e1e1e1;
    }
    .icon-ziyuan {
      font-size: 15px;
    }
    span {
      color: #2f2f2f;
      margin-left: 9px;
    }
  }
}
